SAFE PRACTICS TAKS QUESTIONS SPRING 2003 10: (15)

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SAFE PRACTICS TAKS QUESTIONS


SPRING 2003


10:

(15)
The reason for wafting or fanning a small amount of chemical vapors toward the
nose as a means to detect odors in a test tube is to



A
avoid experimental error from excessive loss of mass of reactants
or products

B
avoid splashing chemicals into the face of any person

C
* protect the respiratory tract against potentially harmful vapors

D
determine the relative strength of the odor before smelling directly


(55)
Laboratory equipment is cleaned and properl
y stored after use primarily so that



A
chemical products can be measured and recorded as data

B
time is saved in setting up the next experiment

C
toxic materials can be kept in the laboratory

D
* the possibility of contamination in the laboratory is mini
mized



SPRING 2003


11:

(1)
The safest way to dilute concentrated sulfuric acid is to add



A
a series of small volumes of water to the acid while stirring

B
* the acid to water slowly while stirring constantly

C
the acid to a small volume of water and t
hen add more water

D
dilute sulfuric acid to a small volume of the concentrated acid


SPRING 2003


11:

(55)
A science class is conducting an experiment that produces noxious fumes. Because
of inadequate ventilation, some students begin to feel nauseated a
nd dizzy. The first
response should be to



A
neutralize the acid that is reacting to produce the noxious fumes

B
carry the reactants outside, away from other students

C
* leave the room and go to an area with fresh air

D
spray the reaction with a fire ext
inguisher












APRIL 2004


10:



(2)
The ingredients described above are used to make a bonding agent. The most
important safety precaution to take when applying this bonding agent is to



F
dry it with a small flame

G
* work in a well
-
ventilated a
rea

H
cover the work area with newspaper

J
wear a lab coat


APRIL 2004


10:

Powerful Plankton


The U.S. Naval Research Laboratory has created an experimental marine fuel cell
that could produce enough electricity to power ocean
-
monitoring devices. This fu
el cell
runs on seawater and sediment, with the help of plankton. Some plankton on the surface
of ocean sediments use dissolved oxygen to break down organic matter, releasing energy;
this is an aerobic process. The plankton in the deeper sediments break do
wn organic
matter without using oxygen; this is an anaerobic process. These two processes create a
difference in voltage between the surface of the sediment and the sediment farther down
in the seabed. The voltage difference can be used to produce electric
ity

up to 5.0

10


2
watts of power. Energy supplied by this type of fuel cell can be obtained as long as
there is organic matter in the sediment.



(15)
Which safety precaution should be observed while analyzing sediment from a
marine aquarium?


A
* Wear

rubber gloves

B
Use a fume hood

C
Avoid using glassware

D
Have a fire extinguisher nearby







APRIL 2004


10:



(35)
A safety checklist for this activity should include the presence of a proper fire
extinguisher and all the following items except a



A
fire blanket

B
receptacle for broken glass

C
laboratory apron

D
* squeeze bottle




























APRIL 2004


11:



(9)
All of these procedures must be followed when using the setup shown above except


A
putting on safety goggles

B
handling
the beaker with tongs

C
securing loose clothing

D
* wearing rubber gloves



JULY 2004


11:

(
15
)

Reactions that produce toxic gases should be

performed in a


A
* laboratory fume hood

B
beaker with a watch glass on top

C
well
-
ventilated area of the lab

D
war
m, airtight drying oven













JULY 2004


11:

(
24
)

Classification symbols for certain fire

extinguishers are shown below. Which class
of

fire extinguisher should be used when a hot

plate overheats and catches on fire?







FALL 2005


11:


7

When
performing this activity, students must remember to




A

label the equipment used


B
* keep hands away from face and mouth


C
sterilize the dissecting needle before use


D

disinfect the fur and feathers removed from the pellet



FALL 2005


11
,
FEBRUARY 20
06


11 #52, JULY 2006


11 #18:



50
This picture indicates that the chemical represented is



F
pressurized

G *
corrosive

H
flammable

J
toxic

OCTOBER 2005


11:

5

The anatomy of grasshoppers is being studied

in a dissection lab. Working in groups of
th
ree,

students make observations using a hand

lens, forceps, and a scalpel. Two of the

students

in a group have finished their
observations. These two students may do all of

t
he
following except



A

* remove their goggles

B

review their notes

C

wash thei
r hands

D

assist their lab partner


APRIL 2006


10:


46
In what part of this process should safety precautions be planned?

F
Q

G
R

H*
S

J
T



APRIL 2006


11:


19
The label shown above contains information about some harmful effects of acetone. A
group

of students plans to use acetone to rinse out a glass container. A second group of
students is working at the same lab table. Which of the following lab procedures should
the second group of students avoid?


A
* Heating water with an open flame

B
Pouring h
ydrochloric acid into a beaker

C
Filtering precipitates from a liquid solution

D
Collecting oxygen from plants in a test tube